Metal-shearing machine.



No. 654,082. Patented lul y l7, I900. B. WESSELMANN.

METAL SHEARING MACHINE.

(Application filed Feb. 10, 1,900.; (No Model.)

WITNESSES:

Cf. 12020 Wamelmam.

BY /m% ATTOBNE S Nrrn Fries.

nrnnr iVlETAL-SHEARING MACHINE.

SPECIFICATION forming part of Letters Eatent No. 654,082, dated July 17,1900.

Application filed February 10, 1900. Serial No. 4,817. (No model.)

To aZZ whom it may concern.-

Be it known that I, BRUNO WEssELMANN, a subject of the King of Prussia,German Emperor, residing at 1 Luisenplatz, Berlin,N. W. Kingdom ofPrussia, and Empire of Germany, have invented new and usefulImprovements in Metal-Shearing Machines, of which the following is aspecification.

My said invention relates to improvements in metal-shearing machines, asis well understood.

In shearing-machines having levers work ing on trunnions or pivotscarried laterally in a frame a great disadvantage exists in that thetrunnions work but one way, and so the pressure gradually causes thetrunnions to work loose or have too much play. This disadvantage soonshows itself when the shears are put to work, the working loose of thetrunnions causing the blades to change their po sition relatively toeach other, so that a faulty cut is performed and more power required tooperate the shears. These disadvantages are emphasized the thinner thesides of the shearframe in which the trunnions are fixed and areespecially apparent in lever-shears which have a rolled profile, as withthese rolled profiles there is a tendency to make the frame,

and therefore the side carrying the levers, as thin as possible.

The object of my invention is to secure a strong and effective supportfor the levers by providing a casting or suitably-formed bracket whichis fixed to the frame so as to give an additional support orcounter-bearing to the heavily-working trunnions. The said casting orbracket also acts as a means of holding down the plate while under theaction of the shears and as a protecting piece or guard.

My invention will be clearly understood from the following descriptionand annexed sheet of drawings,

In the said drawings, Figure 4: shows a front view of a lever-shearconstructed in accord ance with my invention, while Figs. 1 to 3 showthe construction and arrangement of the casting or especially-formedbracket which serves as the additional bearing or countersupport of thetrunnions.

In carrying my invention into effect the frame a, which may be of arolled profile, is provided with a bracket 0, which may be cast orotherwise suitably formed. The bracket 0' is so fashioned as to presenta flat face cl,

which is bolted or otherwise suitably secured of support in the side 17and in the part c, which effectually relieves the one side of the entirestrain. Under this arrangement when pressure is applied the levers areso well supported that it is impossible for them to yield with theirtrunnions upward or downward or even laterally, so that a more reliableand exact working of the blade his thus obtained. Even when cuttingcomparatively-thick plates good cutting results are obtained with thetrunnions so supported.

The specially-shaped piece or bracket 0 does not extend further downthan isindicated in Fig. 2, so that suiiicient free space is left formoving the sheet to be out free between the blade. The bracket 0, ifmade large enough, may also serve as a guard or protector to prevent theworkmans hand from reaching the cutting-point. It is also desirable thatthe bracket 0 should serve as a resser-down or guide for the sheet to beacted upon, and to this end I propose to provide the said bracket with alaterally-projecting ridge or extension e. If desired, thespecially-shaped support'or bracket 0 may be formed in one with the sideb.

The construction of the lever system it t' k may be varied withoutdeparting from the spirit of my invention, the bracket 0 being sodesigned as to give an additional bearing or counter-support to thevarious trunnions.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In a metal-shearing machine, the combination with thebase-frame a, of the parallel trunnion supporting brackets 19, c, risingtherefrom and separated from each other to provide a space for theshearing-blade, and a lateral extension e, on the lower edge of thebracket 0, substantiallyas and for the purpose specified.

2. In a sheet-metal-shearing machine, the combination with thebase-frame a, of the parallel trunnion-supporting brackets b, a, risingtherefrom and separated from each other to said lever and blade,substantially as de- 10 provide a space for the shearing-blade, alatscribed.

eral extension e, on the lower edge of the In testimony whereof I affixmy signature blracke: c, truntnionsD g alllid g, passiiig thlrough inpresence of two witnesses.

t esainsuppor ingrac e s, oneo sai trunnions being located above theother, a shear- BRUNO WESSELMANN' ing-blade h, connected at one end tothe lower Witnesses:

trunnion, an operating-lever 70, connected to WOLDEMAR HAULET,

the upper trunnion, and a link '5 connecting WILLIAM MAYNER.

